AssaultCube

AssaultCube is a FREE, multiplayer, first-person shooter game, based on the CUBE engine.Taking place in realistic environments, with fast, arcade gameplay, it's addictive and fun!With efficient bandwidth usage, it's low-latency and can even run over a 56 Kbps connection. It's tiny too, weighing in at a lightweight about 50 MB package available for Windows, Mac and Linux. On the correct settings, it can even run on old hardware (Pentium III and above).Features in a nutshell:+It's FREE.+Source code is available under a zlib-like open source license.+Low latency, it can even run across a 56 Kbps connection!+Lightweight size, only about 50 MB to download, plus additional maps average 20 KB each!+With the correct settings, it can run on old hardware (Pentium III and above).+Officially runs on most major systems, and maybe even some non-major ones?+Has a built in, in-game map editor to help players create their own maps and allows for co-operative...